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Finding the Fourth Proportional to 93, 128.31 and 80.04

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Solution

The fourth proportional to 93, 128.31 and 80.04 is: 110.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    93 : 128.31 = 80.04 : x
  2. Step 2: Convert to fraction form
    93/128.31 = 80.04/x
  3. Step 3: Cross multiply
    93x = 128.31 × 80.04
  4. Step 4: Simplify right side
    93x = 10,269.93
  5. Step 5: Solve for x
    x = 10,269.93/93
  6. Step 6: Final answer
    x = 110.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.